Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e187cb1903fcaf…

MALICIOUS

PDF

87.0 KB Created: 2021-09-01 00:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97348689a3f90b8f0e3a0621da75852f SHA-1: 12f6064a86212745669a6b1055d2fe794e8b1a69 SHA-256: a0e187cb1903fcaff8082b7c0f7ef68694bf877c2225faf4b32ccc05c463dc65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. This pattern suggests the document is designed to facilitate phishing or malware distribution by leading victims to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://sbox-technology.com/upload/datoteke/bedikudimaweri.pdf In PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/nowojonuwowinapozitazusiw.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4426ad41d---58244920746.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210718233644.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/pewulalekazizopodel.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/fowosudumusavovemotukawo.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021052722565773499.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/77f6eec001c3d14b227d0d8ba432b939/68682393336.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/jafukubafisovoza.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/sejijivegipidiba.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b23e25cfe5---36383347717.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607a95d79ac3a---16180905514.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/51a8opmvu2kiqbdt77879guq1v/39437100730.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/lowuzoxitupexeso.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/rixonu.pdfIn PDF document text
    • https://senfina.top/uploads/files/19765724802.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/21799685218.pdfIn PDF document text
    • http://rc-modeller.se/images/file///nomefubidujejuguzap.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/uhvq76h0af2i5t6bsfuef41ns2/32865010017.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/99059000502.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d429a3ece1---30024619998.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/piwoxudijavejosa.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6019ef32d6---jodorugulasaz.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610502bfdc7e0---jupapoluromaramedol.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f5b715ef---64803675737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=grade+6+agriculture+notesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 10852 bytes
SHA-256: db2792cd3e0c463638310824cf6a993af2a08e211d2ce43832908affe55897eb
font_01_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 17408 bytes
SHA-256: bdcc911f50730a5271d3ede5f213d836e5d9c314f236432ae1b8debe2ae75370
font_02_sfnt_off0001354c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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